Have you ever rubbed your hands together when they get cold? Why do we do that? We do that for friction. Friction happens when two things that aren’t very smooth rub together to make heat energy. The faster you rub two things together, the more friction ( and heat) you can make. Let’s discover friction!
WHAT YOU’LL NEED
·Soap ·Water·Your hands!
WHAT TO DO
Make sure your hands are dirty.
Rub your hands together until you feel the heat of your hands.
Now, use soap and water to get your hands very slippery(滑的).
Try to make friction happen while your hands are slippery.
Please write down what has happened.
LET’S TALK!
Friction is an energy that happens when two things rub together. When friction happens, it makes heat! When your hands are slippery, they won’t make very much friction and your hands won’t get so hot.
DID YOU KNOW?
Friction happens when you stop your fast running bike.
Ancient people made fire by rubbing two pieces of wood together. Friction happened though they didn’t know it.
____?___
Friction is everywhere. Have you ever noticed situations where friction is happening? If not, ask your parents to take you out in a car. If it is not hot, touch the tires(轮胎) of the car before and after a short drive to see how much warmer they get from friction. This text is most probably________________________.
| A．a science report | B．a car advertisement |
| C．a rubbing introduction | D．a chemistry programme |
What does the word “friction” in this text mean in Chinese?
| A．摩擦 | B．冷却 | C．膨胀 | D．震动 |
___________ is not an example of friction.
| A．Bike riding | B．Car driving | C．Hands rubbing | D．Friction discovering |
What’s the last column(栏目)?
| A．THINK IT OVER! | B．WHAT HAPPENED? |
| C．EVERYDAY ACTION: | D．WORK WITH PARENTS |
If you lose (丢失) a set of keys, you can call _________.
| A．Jack | B．Miller | C．Lily | D．Mo Yan |
Miller lost his ________.
| A．keys | B．book | C．bike | D．basket |
.Lily is from _________.
| A．No. 2 Middle School | B．Class 6, Grade 7 |
| C．Building 2 | D．Class 7, Grade 6 |
Frog is ________.
| A．a kind of bike | B．a kind of key |
| C．a kind of animal | D．a name of a book |
Which one is true (正确的)?
| A．Jack lost a set of keys | B．Miller found a book. |
| C．There is a toy bear on the bike. | D．Lily lost a book. |
The Voice of China was hot during the summer of 2012!
The Voice of China is the large music show in China. This show is also the only one which regards the Voice as the only ruler. It premiered at 21:15 on July 13, 2012, on the Zhejiang Television. It has attracted great attention. The show became an overnight sensation.
The first season used “Real voice, real music” as its slogan. As a mentor(导师), singers like Liu Huan, Na Ying, Yu Chengqing and Yang Kun will be responsible for seeking world-shaking voices of China in the following three and a half months, through four stages, namely, “blind choosing”, “selecting”, “team PK” and “yearly grand ceremony”.
It is really a miracle that The Voice of China can stand out in the flood of today’s talent shows in China and attracts the audience. A great many of audience said this will be the best television show in this summer. They were all proud for these good voices of China.
The students’ beautiful voices moved everyone. Xu Haixing, a girl from Chengdu, sang “Self” to realize her father’s dream and Liu Huan was moved to tears by her song. Huang Yong sang “In Spring” showing his persistence on his dream and Yang Kun cried for this. The blind girl Zhang Yuxia, a busker from Taiwan, played while singing. She was praised as “Deng Lijun No.2” for her unique voice, and her sincere feelings touched everybody. Na Ying went to the stage to sing with the students together for two times.
The Voice of China casts off magnificent clothes and wonderful dancing. It regards “inspiration” and “professionalism” as the ruler of music. The singer uses their songs to tell their real stories and the happiness of life.If you want to be the winner of The Voice of China, you must _____.
| A．have a good-looking | B．have special talent |
| C．have a wonderful voice | D．dance and sing well |
The right order of The Voice of China’s program is _____.
a. team PK b. blind choosing. c. selecting d. yearly grand ceremony
| A．c-b-a-d | B．b-c-a-d | C．c-a-b-d | D．d-c-a-b |
From the passage we know Liu Huan was deeply moved by_____ song.
| A．Na Ying’s | B．Xu Haixing’s | C．Huang Yong’s | D．Zhang Yuxia’s |
What is the Chinese meaning of the underlined sentence?
| A．通宵节目 | B．无与伦比 | C．一夜成名 | D．彻夜难眠 |
Which of the following is NOT true according the passage?
| A．The best title of the passage is The Voice of China. |
| B．The Voice of China last three and a half months. |
| C．The fourth paragraph（段落） tells us The Voice of China is hot in China. |
| D．Magnificent clothes and wonderful dancing are rulers of the show. |
This summer, Liu Hongcan, a 30-year-old Chongqing woman, had to say goodbye to her daughter again. She sent her little girl to Guizhou province to stay with her daughter’s grandparents for the summer vacation ______________ in Chongqing.
A list of “hottest cities” in China came out last month. Chongqing is No.1 on the list. Fuzhou and Hangzhou take the second and third place.
The list is based on a “heat index”(热指数).It uses temperature and humidity date(湿度数据)1981 to 2011.The scientists tried to learn how hot the weather was over a period of time, and find out how people feel.
High humidity will stop heat leaving the body. It makes people feel worse on high-temperature. Dryness, on the other hand, can allow heat to leave the body.
In July this year, Chongqing saw 25 days of high temperature (over 35℃). Forty-eight people in the city had heatstroke from the start of April to the middle of August, the local health bureau(卫生局) said.
Chongqing people have to look for different ways to cool down. Throwing themselves into water is a good choice. Lin Jing, a worker at the Caribbean Water Park has received more guests this summer than before. About 15,000 people have visited the park a day during this year’s hot season.Which one should be put in the underlined of the first paragraph?
| A．because it is too dry | B．because it’s too hot |
| C．because there is too much humidity | D．because it is too wet |
According to the temperature, the order is_________.
| A．Chongqing, Hangzhou, Fuzhou, Ningbo |
| B．Fuzhou, Chongqing, Hangzhou, Ningbo |
| C．Chongqing, Fuzhou, Hangzhou, Ningbo |
| D．Ningbo, Fuzhou, Chongqing, Hangzhou |
How can humidity make people feel?
| A．High humidity can make people uncomfortable. |
| B．High humidity can make people comfortable. |
| C．Low humidity can make people uncomfortable. |
| D．Low humidity will stop heat leaving the body |
How many days of high temperature (over 35℃) did Ningbo probably have in July?
| A．20 | B．25 | C．30 | D．24 |
Where is the passage probably from?
| A．Movies. | B．Story book. | C．Newspaper. | D．Science book. |
Many of us don’t pay much attention to the importance of eye care. It is said that if you take care of your body, then you can surely be healthy. That is why our eyes should be given a lot of care. Natural eye care should be put in a number one place.
There are several causes leading to poor eyesight like not enough food, genes(基因) and aging(老化). Televisions, computers and reading are also the causes of having poor eyesight. If you happen to work in front of the computer, it is best to have a rest after working for a while. Something dirty can cause redness and they will make you uncomfortable. It is bad for your eyes, too. If this happens, the best way is to clean your eyes by using cold water. You must also try your best to protect your eyes from harmful things. For example, sunglasses are not just for fashion but they can also serve as a great way to protect your eye-sight from UV rays.
Eating healthy foods will do good to your eyesight. Remember that vitamin A, C and E are good for eyes. Try to eat food groups that have these vitamins. And you should do eye exercises because exercise protects your eyesight, too. If a person exercises regularly(定期的) and eats the right kind of food, his eyes will stay in good condition(状况) for a long time.
All above are natural ways of eye care that help us keep healthy eyes. Being happy all the time can be helpful to a person’s eyesight, too. In a word, eye care is very important, no matter how old a person is.is the most important way to protect our eyes.
| A．Natural eye care | B．Taking medicine |
| C．Seeing a doctor | D．Being happy all the time |
All the following causes can lead to bad eyesight EXCEPT_______.
| A．age | B．height | C．reading | D．computers |
What should you do if you have to work in front of the computer?
| A．Eat healthy foods. |
| B．Clean the eyes by using cold water. |
| C．Wear a pair of sunglasses. |
| D．Have a rest after working for a while. |
What do the underlined words UV rays mean?
| A．沙尘 | B．闪电 | C．紫外线 | D．超声波 |
Which is the best title of the passage?
| A．Ways of eye care | B．Ways of eye exercises |
| C．Ways of Being Happy | D．Ways of Being Healthy |
Once there lived a man in a small town. He often said, “If I have lots of gold(黄金), I shall be the happiest man in the world.” One day he was traveling in North Africa. He lost his way and he was so hungry and thirsty that he couldn’t walk any more. There were only stones and sand around. Just then he saw a bag on the sand. He took it up. But when he opened it, he saw it was full of gold. He left the bag on the sand and cried, “What is the use of gold to a hungry man?” What did the traveler love best?
| A．Food | B．Drinks | C．Stones | D．Gold |
When he lost his ways in the desert(沙漠) of North Africa, __________.
| A．he had nothing to eat or to drink |
| B．he saw a bag full of stones and sand |
| C．he was happy to find a bag of gold |
| D．he found a bag full of drinks |
“He lost his way” means____________________.
| A．“he didn’t know where he was and where to go |
| B．“he didn’t know where he came from” |
| C．“he didn’t know how to return home” |
| D．“he lost what he had on the way” |
When he found a bag full of gold he felt______________.
| A．happy | B．hungry | C．thirsty | D．sad |
What’s the most useful to a hungry man? _____________.
| A．Food | B．Gold | C．Drink | D．Stones |